Slope compensation circuit, method for generating slope compensation current, and converter
A slope compensation and current technology, applied in the direction of output power conversion device, DC power input conversion to DC power output, instruments, etc., can solve the problem of DC-DC converter control loop instability, etc., to reduce sub-harmonic Wave shock, to ensure the effect of stable output
Active Publication Date: 2022-03-22
SHANGHAI AWINIC TECH CO LTD
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[0004] In view of this, the present invention provides a slope compensation circuit, a method for generating slope compensation current, and a converter to solve the problem of unstable control loop of a DC-DC converter
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[0067] The above is the core idea of the present invention. In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention Description, obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0068] An embodiment of the present invention provides a slope compensation circuit for generating a slope compensation signal, such as figure 1 As shown, it includes a compensation control module 1 , a first current generation module...
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The present invention provides a slope compensation circuit, a method for generating a slope compensation current, and a converter. Since the first current is a fixed current, it can pass a fixed smaller The slope compensation current of the slope compensates the inductor current of the DC-DC converter. Since the second current changes with the voltage or current of the first capacitor, and the third current is the mirror current of the second current, therefore, in the process of charging the first capacitor with the first current and the third current, the second current The slope of the second current increases gradually, so that the slope compensation current, that is, the other mirror current of the second current, the slope of the fourth current also gradually increases, so that in the second period, for example, when the duty cycle is greater than 50%, During the time period, the inductor current is compensated by using a slope compensation current whose slope gradually increases, thereby ensuring a stable output of the DC-DC converter.
Description
technical field [0001] The present invention relates to the technical field of DC-DC converters, and more specifically, to a slope compensation circuit, a method for generating slope compensation current and a converter. Background technique [0002] When using PWM (Pulse-Width Modulation, Pulse Width Modulation) current mode to control the DC-DC converter, the slope compensation current will be added to the inductor current to avoid the duty cycle of the power switch tube with fixed cycle switching greater than 50%. , The control loop of the DC-DC converter generates sub-harmonic oscillation, which affects the stable output of the DC-DC converter. [0003] When the duty cycle is greater than 50%, the slope of the increased slope compensation current must be greater than 50% of the absolute value of the slope when the inductor current is falling. Therefore, if the slope compensation current with a fixed slope is used, when the duty cycle is small, the slope The value of the...
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IPC IPC(8): H02M3/158
CPCH02M3/158H02M1/0038
Inventor 严之嶽
Owner SHANGHAI AWINIC TECH CO LTD